diff --git a/msgp/json_bytes.go b/msgp/json_bytes.go
index 88ec6045..d4fbda63 100644
--- a/msgp/json_bytes.go
+++ b/msgp/json_bytes.go
@@ -72,7 +72,7 @@ func writeNext(w jsWriter, msg []byte, scratch []byte, depth int) ([]byte, []byt
 		if err != nil {
 			return nil, scratch, err
 		}
-		if et == TimeExtension {
+		if et == TimeExtension || et == MsgTimeExtension {
 			t = TimeType
 		}
 	}
@@ -276,7 +276,7 @@ func rwExtensionBytes(w jsWriter, msg []byte, scratch []byte, depth int) ([]byte
 	}
 
 	// if it's time.Time
-	if et == TimeExtension {
+	if et == TimeExtension || et == MsgTimeExtension {
 		var tm time.Time
 		tm, msg, err = ReadTimeBytes(msg)
 		if err != nil {
diff --git a/msgp/read.go b/msgp/read.go
index 1adca170..d15355e2 100644
--- a/msgp/read.go
+++ b/msgp/read.go
@@ -260,7 +260,7 @@ func (m *Reader) NextType() (Type, error) {
 			return Complex64Type, nil
 		case Complex128Extension:
 			return Complex128Type, nil
-		case TimeExtension:
+		case TimeExtension, MsgTimeExtension:
 			return TimeType, nil
 		}
 	}
@@ -1287,7 +1287,7 @@ func (m *Reader) ReadTime() (t time.Time, err error) {
 		t = time.Unix(sec, int64(nsec)).Local()
 		_, err = m.R.Skip(15)
 		return
-	case -1:
+	case MsgTimeExtension:
 		switch length {
 		case 4, 8, 12:
 			var tmp [12]byte
diff --git a/msgp/read_bytes.go b/msgp/read_bytes.go
index 17d63bc8..292704dd 100644
--- a/msgp/read_bytes.go
+++ b/msgp/read_bytes.go
@@ -29,7 +29,7 @@ func NextType(b []byte) Type {
 			tp = int8(b[spec.size-1])
 		}
 		switch tp {
-		case TimeExtension:
+		case TimeExtension, MsgTimeExtension:
 			return TimeType
 		case Complex128Extension:
 			return Complex128Type
@@ -1094,7 +1094,7 @@ func ReadTimeBytes(b []byte) (t time.Time, o []byte, err error) {
 		sec, nsec := getUnix(b)
 		t = time.Unix(sec, int64(nsec)).Local()
 		return
-	case -1:
+	case MsgTimeExtension:
 		switch len(b) {
 		case 4:
 			t = time.Unix(int64(binary.BigEndian.Uint32(b)), 0).Local()